Soda and VOL, I certainly agree. I have a friend that grew up in Battlecreek Michigan and whenever she would come down here to visit, I marveled at her northern/nasal accent. Then when she was around 30 she moved to South Carolina and you would declare that she grew up there from the southern drawl that she used. It was quite funny to listen to her. And such a shock. You adapt to your environment, I guess.
People think I have a southern accent, but I don't hear any!